Although I can't reply for cliveh, when I think that the scene looks like it's 1/125 @ f/8 I think of ISO100. And then if I do not use ISO100 I would have to convert or if I don't want to use f/8 or 1/125 I would have to convert too. When I came up to a scene I tend to think it's 1/125 @ f/8 rather than EV13. I would have to use the method described by the OP to convert it to an EV value for ISO100. Taking the above example it's 1/125=7 + f/8=6 so it's EV13 at ISO100. If I am using ISO400 then it's 13+2=EV15. Then If I decide to say use f/11 and that's 7. 15-7=8 and that's 1/250.
Originally Posted by markbarendt